vue前后端分离,使用element的el-button组件从后台下载文件,并且解决乱码问题
1.添加下载按钮
2.(原始方法,会出现乱码)给按钮添加点击事件
添加接口代码
download: function() {
const row = this.tableRadio
// console.log(row)
axios.get('/api/download', {
params: {
reportRuleId: row.reportRuleId
}
}).then(response => {
console.log(response.data);
}).catch(error => { this.$message.error(error) })
}
一直使用的是axios.get()这种请求方式,可以访问后台,但是返回的是一堆乱码
3.(更正版)用axios({})这种方式
配置参数:
- 根据返回的类型response.data.type,如果是文件流application/octet-stream则下载文件,如果是json则显示错误信息;
- 文件名来自http头部的Content-Disposition字段;
axios({
method: 'GET',
url: '/api/download',
params: {
reportRuleId: row.reportRuleId
},
responseType: 'blob'
}).then(response => {
if (response.data.type === 'application/octet-stream') {
// 获取http头部的文件名信息,若无需重命名文件,将下面这行删去
const fileName = response.headers['content-disposition'].split('=')[1]
if (window.navigator && window.navigator.msSaveOrOpenBlob) {
const blob = new Blob([response.data], { type: 'application/zip' })
window.navigator.msSaveOrOpenBlob(blob, fileName)
} else {
const blob = new Blob([response.data], { type: 'application/zip' })
const url = window.URL.createObjectURL(blob)
const link = document.createElement('a') // 创建a标签
link.href = url
link.download = fileName // 文件重命名,若无需重命名,将该行删去
link.click()
URL.revokeObjectURL(url) // 释放内存
}
resolve(response)
} else {
const reader = new FileReader()
reader.onload = function(event) {
const msg = JSON.parse(reader.result).data
_this.$errorMsg(message) // 将错误信息显示出来
}
reader.readAsText(response.data)
}
}).catch(error => _this.$errorMsg(error) )
这样就可以成功下载到.zip文件
4.报跨域问题
经过排查,我这边产生这个问题的原因是参数格式,如下图,我的参数存在一个JOSN字符串,导致报错
解决办法:
使用qs模块将params参数格式转换一下 ,将下面这行代码放在params后面
paramsSerializer: params => { return qs.stringify(params, { arrayFormat: 'brackets' }) }
type:'application/zip'可以更改下载文件的类型
具体有以下这些类型:
'doc' => 'application/msword',
'bin' => 'application/octet-stream',
'exe' => 'application/octet-stream',
'so' => 'application/octet-stream',
'dll' => 'application/octet-stream',
'pdf' => 'application/pdf',
'ai' => 'application/postscript',
'xls' => 'application/vnd.ms-excel',
'ppt' => 'application/vnd.ms-powerpoint',
'dir' => 'application/x-director',
'js' => 'application/x-javascript',
'swf' => 'application/x-shockwave-flash',
'xhtml' => 'application/xhtml+xml',
'xht' => 'application/xhtml+xml',
'zip' => 'application/zip',
'mid' => 'audio/midi',
'midi' => 'audio/midi',
'mp3' => 'audio/mpeg',
'rm' => 'audio/x-pn-realaudio',
'rpm' => 'audio/x-pn-realaudio-plugin',
'wav' => 'audio/x-wav',
'bmp' => 'image/bmp',
'gif' => 'image/gif',
'jpeg' => 'image/jpeg',
'jpg' => 'image/jpeg',
'png' => 'image/png',
'css' => 'text/css',
'html' => 'text/html',
'htm' => 'text/html',
'txt' => 'text/plain',
'xsl' => 'text/xml',
'xml' => 'text/xml',
'mpeg' => 'video/mpeg',
'mpg' => 'video/mpeg',
'avi' => 'video/x-msvideo',
'movie' => 'video/x-sgi-movie',
以上为个人经验,希望能给大家一个参考,也希望大家多多支持编程网。